Travis fix: pip install --user IOError: [Errno 13] Permission denied: '/usr/local/lib/python2.7/dist-packages/nodeenv.py'

Author: Lucas-C

.travis.yml

@@ -1,4 +1,8 @@
 language: java
 jdk: oraclejdk8
-install: pip install --upgrade -r dev-requirements.txt
+# Installing packages globally fails with:
+#   File "/usr/lib/python2.7/shutil.py", line 83, in copyfile
+#     with open(dst, 'wb') as fdst:
+# IOError: [Errno 13] Permission denied: '/usr/local/lib/python2.7/dist-packages/nodeenv.py'
+install: pip install --user --upgrade -r dev-requirements.txt
 script:  pre-commit run --all-files